Cultivator disk sharpener



Feb. 16, 1932. J. TRUNEC 1,845,944

CULTIVATOR DISK SHARPENER Filed June 15, 1928 2 Sheets-Sheet l 9 I 3 20 INVENTOR.

Mare 0% flvawc Feb. 16, 1932. J. TRUNEC GULTIVATOH DISK SHARPENER Filed June 13, 1928 2 Sheets-Sheet 2 INVENTOR.

A TTORNEY.

Patented Feb. 16, 1932 UNITED STATES JOSEPH TRUNEC, OF STANTON, NEBRASKA CULTIVATOR DISK SHARPENER Application filed June 13, 1928. Serial No. 285,129.

The invention relates to cultivator disk sharpeners and has for its object to provide adevice of this character wherein the disk is held at any desired angle in relation to an 61 abrading element and rotated whereby the disk bevel will be sharpened uniformly around the entire disk.

A further object is to provide means whereby the disk holder may be adjusted in relation to the grinding element for varying the an le of the bevel of the disk, and means for ho ding the disk whereby the disk may be adjusted downwardly towards the grinding element incident to wear on the disk and constant sharpening.

A further object is to rovide the machine at opposite sides of the isk holder with adjustable wheels, engaging the under side of the disk for preventing wobbling or chattering of the disk during the sharpening operation.

A further object is to pivotally mount the disk holder in a frame pivoted on the drive shaft and to provide means whereby the disk holder frame may be varied in position.

A further object is to provide a pivoted lever above the disk and provided with a hearing wheel positioned above the grinding element and adapted to have a rolling contact with the disk, whereby the disk can be forced into close engagement with the grinding element.

A further object is to provide a cultivator disk holding and rotating machine for grind-' ing purposes comprising a base, a shaft rotatably mounted in said base and having a drive wheel, a disk holder frame pivotally mounted on the shaft and having a worm gear and worm drive connection with the shaft for rotating the holder shaft and means cooperating with the holder frame, whereby said frame and the holder shaft may be moved to various ositions according to the position of the cultivator disk in relation to a grind ing element. Also to provide clutch means whereby the drive shaft may be rotated as desired.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth,

shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of the invention maybe made within the scope of what is claimed without departing from the spirit of the invention. a v

In the drawings:

Figure 1 is a side elevation of the disk holder.

Figure 2 is a front elevation of the disk holder. i t

Figure 3 is a top plan view of the disk holding machine.

Figure 4 is a vertical transverse sectional view through a disk and the adjacent disk holder.

Referring to the drawings, the numeral 1 designates the base of the machine, which base is substantially U-shaped as shown in Figure 3, and has its arms 2 connected together by a transversely disposed brace rod 3. Mounted on the upper side of the arms 2 of the base are bearing members 4, in which is rotatably mounted a horizontally disposed drive shaft 5. Rotatably mounted on the drive shaft 5 is a drive ulley 6, which drive pulley is adapted to be riven by a belt leadmg to any source of power. Slidably mounted on the shaft 5 is a clutch element 7 which cooperates with the pulley 6 in any conventional manner for lockingthe pulley 6 to the shaft 5 whereby saidshaft will be rotated by the ulley. The clutch element 7 is controlled y an operating lever 8, one end of which is pivotally connected at 9 to the frame 1 and has a conventional form of clutch yoke 10 for controlling the clutch element 7 The outer end ofthe lever 8 has pivoted thereto at 11 a connecting rod 12, which connecting rod is pivotally connected at 13 to an operating lever 14, and it will be seen that by manipulating the operating lever 14, the clutch element 7 may be controlled for locking the drive ulley 6 into driving connection with the sha t 5.

Disposed above the drive shaft 5 is an inclined U-shaped frame 15, in bearin s of which is rotatably mounted an upwardl y inclined shaft 16. The frame 15, atopposite sides thereof is provided with downwardly extending arms 17 which are rockably mounted on the drive shaft 5 whereby the shaft 16 may be moved to various inclinations. The lower end of the shaft 16 is provided with a worm gear 18, which worm gear meshes with a worm 19 carried by the shaft 5, therefore it will be seen that the shaft 5 will impart rotation to the shaft 16.

The frame 15 is moved and held in various positions by means of a threaded rod 20, which is pivotally mounted at 21 on the brace rod 3 and extends upwardly to an enlarged aperture 22 in one of the arms of the U- shaped frame 15 and is provided with nuts 23, which after proper adjustment are tightened for holding the frame 15 in adjusted position. Mounted on the upper side of the tiltable frame 15 is a bracket 24, the opposite sides of which are provided with upwardly extending arms 25, on which are vertically adjustable arms 26, the upper ends of which are provided with rollers 27 which engage the under side of the disk 28 for preventing tilting and chattering of the same as the disk is rotated during the sharpening operation.

The upper end of the shaft 16 is provided with an enlargement 29 slidably mounted in block 30, and extending through the enlargement 29 is a bolt 31 which extends through the slots'32 in the block 30 and forms means whereby said block may be held in various axial positions in relation to the shaft 16 for supporting the disk 28 in various positions in relation to the grinding wheel 33 and allows the disk to be adjusted upwardly or downwardlyaccording to the bevel of the disk 28 or wear on the disk and grinding wheel. The grinding wheel may be a stationary one and may be driven in any suitable manner. It will be noted by adjusting the frame 15 and the shaft 16 to various positions, the angle of the bevel of the disk 28 may be varied. It will also be noted as the disk 28 is rotated continuously in one direction, the same amount of grinding will take place entirely around the disk, thereby insuring a uniform sharpening operation. Sometimes it is advisable to provide pressure on the disk above the grinding element 33 for forcing the disk in close engagement with the grinding element.

The applying of pressure to the disk 8 is obtained by'means of a wheel 34 carried by a pivoted lever 35, which lever is pivotally connected at 36 to an upwardly extending arm 37 and is adapted to be grasped by the operator and forced downwardly so that the wheel 34 will have a rolling contact with the upper side of the disk 28 for forcing the disk downwardly against the grinding ele ment 33. The lower end of the arm 37 terminates in a horizontally disposed arm 38 having an elongated slot 39 therein and extending through said slot 39 and a bracket 40 carried by the frame 1 is a bolt 41, therefore it will be seen that the arm 37 may be adjusted inwardly and outwardly for positioning the pressure wheel 34 in various positions in rela tion to the periphery of the cultivator disk 28 according to the position it is desired to apply pressure. The disk 28 is held on the upper end of the shaft 16 by means of a plurality of washers 42, which may be formed from any material and by a nut 43 threaded on the upper end of the shaft, therefore it is seen the disk is positively held and may be easily removed or placed in position.

From the above it will be seen that a cultivator disk holder is provided for sharpening purposes, wherein a disk may be held at various angles in relation to the sharpening element, said disk will be rotated thereby insuring a uniform grinding entirely around the disk. It will also be seen that the bevel may be easily and quickly varied.

The invention having been set forth what is claimed as new and useful is A cultivator disk holder comprising a base, a horizontally disposed drive shaft mounted on the base, an upwardly inclined driven shaft to one side of the drive shaft, gear connection between the drive shaft and driven shaft, a U-shaped frame above the drive shaft in a vertical and transverse plane and having spaced arms, said driven shaft being rotatably mounted in bearings of the spaced arms,

the lower spaced arm being longer than the upper spaced arm, an adjusting bolt carried by the base and cooperating with the long spaced arm for tilting the U-shaped frame, spaced downwardly extending arms carried by the lower arm of the U-shaped frame and rockably mounted on the drive shaft and means carried by the driven shaft above the .(lil-slhaped frame for receiving a cultivator In testimony whereof I hereunto afiix my signature.

JOSEPH TRUNEC. 

